8321897081 has 4 divisors (see below), whose sum is σ = 8338442112. Its totient is φ = 8305352052.

The previous prime is 8321897009. The next prime is 8321897093. The reversal of 8321897081 is 1807981238.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8321897081 is a prime.

It is a super-2 number, since 2×8321897081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8321894081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8271761 + ... + 8272766.

It is an arithmetic number, because the mean of its divisors is an integer number (2084610528).

Almost surely, 2^8321897081 is an apocalyptic number.

It is an amenable number.

8321897081 is a deficient number, since it is larger than the sum of its proper divisors (16545031).

8321897081 is a wasteful number, since it uses less digits than its factorization.

8321897081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16545030.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 8321897081 is about 91224.4324783662. The cubic root of 8321897081 is about 2026.4728059888.

The spelling of 8321897081 in words is "eight billion, three hundred twenty-one million, eight hundred ninety-seven thousand, eighty-one".